Observations of Internal Structure Changes in Shoaling Internal Solitary Waves Based on Seismic Oceanography Method

High spatial resolution and deep detection depths of seismic reflection surveying are conducive to studying the fine structure of the internal solitary wave. However, seismic images are instantaneous, which are not conducive to observing kinematic processes of the internal solitary waves. We improve...

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Autores principales:	Haibin Song, Yi Gong, Shengxiong Yang, Yongxian Guan
Formato:	article
Lenguaje:	EN
Publicado:	Frontiers Media S.A. 2021
Materias:	internal fine structure internal solitary wave shoaling northern South China Sea seismic oceanography Science Q General. Including nature conservation, geographical distribution QH1-199.5
Acceso en línea:	https://doaj.org/article/d4cff96f60a34f849bfd7320aec884a4
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id	oai:doaj.org-article:d4cff96f60a34f849bfd7320aec884a4
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spelling	oai:doaj.org-article:d4cff96f60a34f849bfd7320aec884a42021-11-11T10:23:43ZObservations of Internal Structure Changes in Shoaling Internal Solitary Waves Based on Seismic Oceanography Method2296-774510.3389/fmars.2021.733959https://doaj.org/article/d4cff96f60a34f849bfd7320aec884a42021-11-01T00:00:00Zhttps://www.frontiersin.org/articles/10.3389/fmars.2021.733959/fullhttps://doaj.org/toc/2296-7745High spatial resolution and deep detection depths of seismic reflection surveying are conducive to studying the fine structure of the internal solitary wave. However, seismic images are instantaneous, which are not conducive to observing kinematic processes of the internal solitary waves. We improved the scheme of seismic data processing and used common-offset gathers to continuously image the same location. In this way, we can observe internal fine structure changes during the movement of the internal solitary waves, especially the part in contact with the seafloor. We observed a first-mode depression internal solitary wave on the continental slope near the Dongsha Atoll of the South China Sea and short-term shoaling processes of the internal solitary wave by using our improved method. We found that the change in shape of waveform varies at different depths. We separately analyzed the evolution of the six waveforms at different depths. The results showed that the waveform in deep water deforms before that in shallow water and the waveform in shallow water deforms to a greater degree. We measured four parameters of the six waveforms during the shoaling including phase velocity, amplitude, wavelength, and slopes of leading and trailing edge. The phase velocity and amplitudes of waveforms in shallow water increase, the wavelengths decrease, and the slopes of trailing edge gradually become larger than that of the leading edge, while the amplitudes of the deep water waveforms do not change significantly and the phase velocities decrease. Our results are consistent with previous studies made by numerical simulations, which suggest the effectiveness of the new processing scheme. This improved scheme cannot only study the internal solitary waves shoaling, but also has great potential in the study of other ocean dynamics.Haibin SongYi GongShengxiong YangShengxiong YangYongxian GuanYongxian GuanFrontiers Media S.A.articleinternal fine structureinternal solitary waveshoalingnorthern South China Seaseismic oceanographyScienceQGeneral. Including nature conservation, geographical distributionQH1-199.5ENFrontiers in Marine Science, Vol 8 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	internal fine structure internal solitary wave shoaling northern South China Sea seismic oceanography Science Q General. Including nature conservation, geographical distribution QH1-199.5
spellingShingle	internal fine structure internal solitary wave shoaling northern South China Sea seismic oceanography Science Q General. Including nature conservation, geographical distribution QH1-199.5 Haibin Song Yi Gong Shengxiong Yang Shengxiong Yang Yongxian Guan Yongxian Guan Observations of Internal Structure Changes in Shoaling Internal Solitary Waves Based on Seismic Oceanography Method
description	High spatial resolution and deep detection depths of seismic reflection surveying are conducive to studying the fine structure of the internal solitary wave. However, seismic images are instantaneous, which are not conducive to observing kinematic processes of the internal solitary waves. We improved the scheme of seismic data processing and used common-offset gathers to continuously image the same location. In this way, we can observe internal fine structure changes during the movement of the internal solitary waves, especially the part in contact with the seafloor. We observed a first-mode depression internal solitary wave on the continental slope near the Dongsha Atoll of the South China Sea and short-term shoaling processes of the internal solitary wave by using our improved method. We found that the change in shape of waveform varies at different depths. We separately analyzed the evolution of the six waveforms at different depths. The results showed that the waveform in deep water deforms before that in shallow water and the waveform in shallow water deforms to a greater degree. We measured four parameters of the six waveforms during the shoaling including phase velocity, amplitude, wavelength, and slopes of leading and trailing edge. The phase velocity and amplitudes of waveforms in shallow water increase, the wavelengths decrease, and the slopes of trailing edge gradually become larger than that of the leading edge, while the amplitudes of the deep water waveforms do not change significantly and the phase velocities decrease. Our results are consistent with previous studies made by numerical simulations, which suggest the effectiveness of the new processing scheme. This improved scheme cannot only study the internal solitary waves shoaling, but also has great potential in the study of other ocean dynamics.
format	article
author	Haibin Song Yi Gong Shengxiong Yang Shengxiong Yang Yongxian Guan Yongxian Guan
author_facet	Haibin Song Yi Gong Shengxiong Yang Shengxiong Yang Yongxian Guan Yongxian Guan
author_sort	Haibin Song
title	Observations of Internal Structure Changes in Shoaling Internal Solitary Waves Based on Seismic Oceanography Method
title_short	Observations of Internal Structure Changes in Shoaling Internal Solitary Waves Based on Seismic Oceanography Method
title_full	Observations of Internal Structure Changes in Shoaling Internal Solitary Waves Based on Seismic Oceanography Method
title_fullStr	Observations of Internal Structure Changes in Shoaling Internal Solitary Waves Based on Seismic Oceanography Method
title_full_unstemmed	Observations of Internal Structure Changes in Shoaling Internal Solitary Waves Based on Seismic Oceanography Method
title_sort	observations of internal structure changes in shoaling internal solitary waves based on seismic oceanography method
publisher	Frontiers Media S.A.
publishDate	2021
url	https://doaj.org/article/d4cff96f60a34f849bfd7320aec884a4
work_keys_str_mv	AT haibinsong observationsofinternalstructurechangesinshoalinginternalsolitarywavesbasedonseismicoceanographymethod AT yigong observationsofinternalstructurechangesinshoalinginternalsolitarywavesbasedonseismicoceanographymethod AT shengxiongyang observationsofinternalstructurechangesinshoalinginternalsolitarywavesbasedonseismicoceanographymethod AT shengxiongyang observationsofinternalstructurechangesinshoalinginternalsolitarywavesbasedonseismicoceanographymethod AT yongxianguan observationsofinternalstructurechangesinshoalinginternalsolitarywavesbasedonseismicoceanographymethod AT yongxianguan observationsofinternalstructurechangesinshoalinginternalsolitarywavesbasedonseismicoceanographymethod
_version_	1718439261582131200

Observations of Internal Structure Changes in Shoaling Internal Solitary Waves Based on Seismic Oceanography Method

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